#include<iostream>
int main()
{
	std::cout << "enter two numbers:" << std::endl;//输出运算符
	int v1 = 0, v2 = 0;
	std::cin >> v1 >> v2;//输入运算符
	std::cout << "the sum of " << v1 << " and " << v2 << " is " << v1 + v2 << std::endl;
	return 0;
}